Fresh OP install return an error message

Hi all,

I'm actually running different Drupal distros (not multisites), each one having its own database (for technical and testing purpose). We are using Postgresql.
It goes like this:
1 - std drupal 7.18 + drupal_db: Install reach to end like a charm, no error msg.
2 - pushtape + pushtape_db : no error either.
3 - OpenPublish + openp_db : return this,

Error message

Notice: Undefined index: fields in field_info_fields() (line 596 of /var/www/bwb/modules/field/field.info.inc).
Warning: Invalid argument supplied for foreach() in field_info_fields() (line 596 of /var/www/bwb/modules/field/field.info.inc).

I've not find anything on this by myself, any advices?